Fix import error for Python 2.
Fix import error for Python 2.

sing1ee/drum,j00bar/drum,renyi/drum,tsybulevskij/drum,yodermk/drum,j00bar/drum,renyi/drum,sing1ee/drum,yodermk/drum,skybluejamie/wikipeace,abendig/drum,renyi/drum,tsybulevskij/drum,yodermk/drum,sing1ee/drum,abendig/drum,abendig/drum,skybluejamie/wikipeace,stephenmcd/drum,stephenmcd/drum,j00bar/drum,tsybulevskij/drum